CODEWITHSUNDEEP
iosswift
WebOrCode
WebOrCode

Reputation: 7312

How to check are 3 strings equal in Swift?

I this is my code, and it is working

if (v1 == v2) && (v2 == v3) {
    println("3 strings are equal")
}

Is there any other more Swift way to do it ?

My implementation look like C code :-)

Upvotes: 3

Views: 1045

Answers (4)

Thorsten Karrer
Thorsten Karrer

Reputation: 1365

If you want to be really swifty, you can check an array of strings to be all equal like this (you could wrap that in an extension, of course):

var array = ["test", "test", "test"]
var allEqual = array.reduce(true, combine: { (accum: Bool, s: String) -> Bool in
    accum && s == array[0]
})

I would probably not call it either extremely elegant or super efficient... but it certainly works.

Upvotes: 1

Sandy Chapman
Sandy Chapman

Reputation: 11341

You could do something cool like this:

extension Array {

    func allEqual(isEqual: (T, T) -> Bool) -> Bool {
        if self.count < 2 {
            return true
        }
        for x in self {
            if !isEqual(x, self.first!) {
                return false
            }
        }
        return true
    }
}

And then invoke it like this:

["X", "Y", "Z"].allEqual(==) // false
["X", "X", "X"].allEqual(==) // true
let one = "1"
var ONE = "1"
var One = "1"
[one, ONE, One].allEqual(==) // true

Upvotes: 2

rickster
rickster

Reputation: 126167

I don't think so. That's about as straightforward as it gets. (And an improvement on C and ObjC, too — you can use the == operator instead of calling strcmp or isEqual:.)

If you really want to go nuts with it, you might be able to write v1 == v2 == v3 if you created a couple of custom == operator overloads. (This is left as an exercise for the reader.) But it's probably not worthwhile.

Upvotes: 4

tmnd91
tmnd91

Reputation: 449

You can use an extension for the string class like this :

extension String {
    func allEquals (s1: String, s2: String) {
        (this == s1) && (s1 == s2)
    }
}

I didn't compiled it but it should work ;)

Upvotes: 1

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